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The Piovaticci Team
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Jan Thiel collaborated again with Martin Mijwaart when he asked him to joined a new team. This was to build a winning racing bike for the then, Italian top rider, Eugenio Lazzarini. This racing machine was to be called The Piovaticci.
The first Piovaticci machine, which Jan and Martin took over was actually a "re-badged" 125cc Maico mount. 
There was also a 250cc version. Both Maico machines were not very successful in competition with the other more advanced racing bikes on the tracks and a change of direction was needed. 
So this new chassis had its cast magnesium wheels made by Franco Ringhini but later, in 1976, Campagnolo wheels were fitted which gave us an added advantage in weight. "However, while we were working for Piovaticci in Pesaro we made a set of casting moulds for the engine barrels, and from this mould we made all Piovaticci and Bultaco cylinders". Jan Thiel 2008
Jan Thiel tells how Jamathi became Piovaticci:
"In 1974 Martin and I had two complete Jamathi bikes, with engines that were machined from solid billet aluminium. When we went to Piovaticci in October 1974 we took with us one complete Jamathi racing bike with fully tuned engine and a spare engine at the same level of tune. 
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"Outside the Piovaticci factory in Pesaro, Italy, No. 165 is the modified, re-wheeled, re-painted Jamathi and No. 14 is the new 1975 Piovaticci, new in frame and engine."
After arriving in Pesaro we went testing with the Jamathi, repainted in Piovaticci colours at the Misano circuit. Lazzarini was really very small and he went out and did one lap of the circuit and came back into the pits, he could not get right up to the handlebars for safe comfort as the bike was too long for him. He said to the team "I can not ride the bike in its current set-up as I am seated too far away from the front and I feel distanced from the clip-ons.
We had to modify the chassis by shortening the length of the frame to put him into a more forward position. When we went back to Misano after this he beat the lap record, a very good start!   We then realised that with this more forward position we would also be able to seat him a little bit lower in the frame, so making a really very small bike. Martin then decided to build a new frame suitable only for Lazzarini's figure! This was a very small machine in height, length and width and it was also the very first 50cc racer with cast alloy wheels.
"The main reason for making them was that they were very narrow, giving an aerodynamic advantage, they were very stiff and handled very well but they were very difficult to make. Our frames were identified by year, usually we made one new frame each year using last year's experience. The first monocoque was made in 1972, It handled very well but there was, at that time, a problem with the engine". 
Jan Thiel reviews the monocoque frame approach:
For 1973 there was a new frame and engine and this engine, with a second one made in 1974 later became Piovaticci and Bultaco. In 1974 two frames were made and at the end of the season one complete bike and the engine of the other bike were sold to Piovaticci. The second frame was sold to our friend Juup Bosman and fitted with a Kreidler engine. Our colours in 1974 were blue and yellow. I don't remember why apart from the fact that when we joined Piovaticci the MAICO colours of the 125cc were also Blue and Yellow.!
Jan working at the milling machine in the workshop of Piovaticci
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These pictures are for example only and show a 125cc Maico Road Racer
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Unfortunately in 1975 Piovaticci could no longer afford the expenses of the racing activities and these were terminated. Thiel and Mijwaart then put their skills at the disposal of Bultaco and began to developed their race bikes.
With the hiring of Jan and Martin, to develop a completely new 50cc and 125 cc racing machine, which was to include both the rolling chassis and the engine, these new bikes were extremely successful.
The second, complete, rolling chassis was sold to ourfriend Juup Bosman and fitted with a Kreidler engine, becoming a very successful machine. Juup won the 1974 National Championship in Juvent.
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The first race of the season was in Modena, we had the fastest practice time and Piovaticci celebrated it with a meal for about 30 people.The next day we won the race with a big lead, and this was celebrated again. 
Many people have interviewed Jan over the years to build a picture of the sheer effort needed to develop the engines and technology with the running gear that he has created, and I have taken paragraphs from these interviews, re-translated them and used them to build my picture of how I see the story.
Question; In 1974, you and Martin moved to Piovaticci. How did you enjoy that when you found you could finally realize your ideas without first having to look into the wallet?
In the beginning it was not very easy, because we did not speak Italian, but it was only a matter of time before we could. It was, of course, fantastic to finally be able to work exclusively on racing engines.
We did not know the financial situation of course, as there seemed to be no lack of money at all. But we worked very hard and sometimes Piovaticci came late at night and brought with him some guests, such as the president of the Pesaro Motor Club, the Mayor or the local Police Chief, but also, at times his hairdresser or a bank manager. All Pesaro was very enthusiastic about motorsport, it was even more important than football. We also heard the latest news every day, for example, when something special was happening at Morbidelli, we knew about it within a few hours and the reverse was probably the same. It was an incredibly beautiful time that you could not forget!
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Question: In the same year, you also brought out a 125cc two-cylinder two stroke engine (Dutch TT 1975). Did you ever want to get a grip on the larger class?
We had been thinking about the construction of a 125s for a long time, but in the Jamathi period it was unthinkable for financial reasons. I unfortunately made a big mistake at the time in the basic design of our prototype and decided to make a mid-drive because the Japanese racing engines had that too. 
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This decision has brought us a number of years with many disadvantages. Jörg Möller created a much better approach at the time when he could benefit, based on the knowledge according to his experiences with the Bridgestone Twin of Jos Schurgers. At that time, I had assumed, wrongly as it now appears, that a transmission of force through the lateral crankshaft would be too great a risk for the mechanical stability of the engine. This risk I took was not pulled out of the air as the Morbidelli Twin, who sold a twin engined racing machine, experienced a lot of trouble with broken crankshaft stumps.
Jamathi Page
Question: By the end of 1975, Piovaticci had to close the gates again, while you were just beginning to get a good start in the GP scene, could this have caused you to lose the courage to continue?
The fact that Piovaticci had to close was a huge disappointment, and I still have not realized what really happened, everything went by very quickly at that time. I think there was a problem with an unconceived credit, the race management was not the reason. But Mr. Piovaticci also controlled the money very loosely, so he had never checked our expense accounts checking them against the money he had coming in. The disappointment was of course still much bigger for him, he had his whole factory taken away from him and he did not have much longer to live. After this situation Martin and I had received an offer from Spain to work for Angel Nieto at BULTACO.
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The BULTACO Page
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The Piovaticci Team
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